Simple plastic, no need for anything more. Sadly I have an old Yamaha, and I bought this with a new case, since I was told the inside was quite big. Turns out it can't fit in the case, even tho it's snug with the sax. I think if I went with the Yamaha body protector it would have worked, because of my saxophone's size, but if you aren't sure just get a few, they are pretty cheap.